Furnace



June 3, 1941. M Q g pso 2,244,173

. FURNACE Filed June 15, 1938 3 Sheets-Sheet 2 will] r I I i //v4/E/\/777 2?? MAX caucumznson Z4 5 45 7 47 Q 472 43 LJ I f Patented June 3, 1941 I Max 0. Richardson, Portland, Greg, assigncr to Iron Firen Manufacturing Company, Portland, Oreg.

Application June 115, 1938, Serial No. 213,829

(ill. mill-99) 2 Claims.

This invention relates generally to heating appliances, and particularly to a warm air furnace.

The main object of this invention is to construct a furnace in which the body and radiator portions are in the form of aerofoils for the Fig. Fig. 3. r

Fig. 5 is a horizontal section taken along the line 5-4; in Fig. 2.

Fig. 6 is a fragmentary vertical section showing a modified use of the device in connection with an oil burner.

Similar numerals refer to similar parts t is a section taken along the line l i in throughout the several views.

Referring in detail to the drawings, there is shown a base it} around which are constructed the upright side walls M and i2 and the end that all of the hot gases produced within the furnace will pass through the various radiator elements in series.

The fourth object is to so construct a furnace that it will have sufliclent radiating surfaces for heat and relatively large gas passageways in order that accumulations of fly ash will. not impair its effici ncy.

The fifth object is to so construct a furnace that incombustibles remaining in the furnace can be put into an ash can which is disposed within the furnace itself.

The sixth object is to so construct a furnace asto especially adapt it for use in connection with a stoker in which the retort is disposed between the coal bin and the stoker drive mechanism and in which the stoker is contained within the furnace itself.

The seventh object is to construct a furnace in a manner that stokcrs may be disposed therein in any one of several positions to better adapt it to the requirements of a given installation.

The eighth object is to construct an improved form of furnace which is relatively easy to manufacture and which will extract heat from the burned gases at a substantially uniform rate across its entire heat transferring area.

The ninth object is to construct a furnace of the class described which is readily interchangeable for use in connection with a stoker for solid fuel or for use in connection with oil burning equipment.

These and other objects are accomplished in the manner set forth in the following specification as illustrated in the-accompanying drawings, in which:

Fig. 1 is a plan view of the furnace showing its relation to a coal bin and chimney.

'Fig. 2 is a vertical section taken along the line 2-2 in Fig. 1.

Fig. 3 is a vertical section taken along the line 3-3 in Fig. 2.

walls l3 and M. The end walls it and i i connect with the sloping'portions it of the casing hood whose edges it are upturned.

Withinthe furnace and spaced above the base it are the combustion chamber walls ll which converge toward the ridge it which is substantially along one centerline of the furnace. The lower ends it of the walls Ill are curved inwardly toward the bottom 20 which is provided with a circular flanged opening 2! into which extends the retort base 22 of a coal burning stoker. The cast iron fire pot liner 23 is placed around the inner side of. the curved portion H? as shown in Fig. 3.

The combustion chamber walls ill and the curved portion it are closed by means of the with a fire door 29 which may be of any convenient type. The bottom 30 of the flanged member 27 is provided with a flanged opening 311 through which ashes may pass into the ash can 32 which is disposed on the under side of the bottom 30. The combustion chamber walls ii are supported by the upright legs 33 which rest upon the base it.

Liners 3d, 35 and 36 are spaced from the walls H, l2, l3 and It for the purpose of preventing heat from reaching the outer walls it to it, inclusive. 4

0n opposite sides of the combustion chamber walls ii are disposed the streamlined radiators 3i and 38, the former of which is connected'by means of a flanged smoke collar 29 with the wall ll, whereas the radiator 38 is connected by means of the transverse duct it with the radiator 31. It will be noted that the'lower side ll of the transverse duct t0 extends .well below the top of the smoke outlet opening 42 which is joined by the smoke pipe 43 to the chimney M. It is desirable to provide clean-=out openings 45 commodating the passageway to the increased volume caused by the rising temperature of the air passing therethrough.

The retort base 22 has connected thereto acoal feeding tube d8 which contains a coal feeding worm 39 which extends into the coal bin d. The worm' id'extends through the retort 5! which is formed within the retort base 22 and thence into the tube 52 from whence its'shaft 53 connects with the transmission contained within the housing 55%. An electric motor 55 furnishes the power to drive the shaft 53'and also the fan contained within the casing 56 which delivers air into the retort base 22 through the air duct 57. The retort Si is provided with slots 53 through which air can escape from the plenum chamber 59 to which it is delivered through the duct 57.

In the form of the device shown in Fig. 6, an oil burner 66 is disposed within the compartment ti which formerly held the housing 5 3 of the stoker. In this form of the device, it is desirable to provide a fire pot S2 of a refractory material which is preferably confined within a metallic container 53. A trough 5 is formed around the container 63 and it is used to form a seal between the members 83 and i9. A sealing composition 65 is placed in the trough 55. An air intake pipe 66 delivers cold air through the wall 52,

It can be seen from the foregoing that I have provided a furnace which possesses a number of desirable characteristics inasmuch as it is self contained and has incorporated therein either a coal burning stoker or an oil burner which may occupy various positions with relation to the furnace.

It will also be noted that when a coal burning stoker is employed that clinkers may be picked out of the retort 56 with suitable tongs and dropped through the opening 3i into the ash can 32 without moving the clinkers out of the furnace proper so that any dust which rises from the clinker removing operation will be carried out through the smoke pipe 63 instead of escaping into the furnace room.

Special attention is called to the fact that there is a natural flow of air through passages of increasing dirnensions across which passageways heat isconducted and reflected in the path of the air currents, the net result of which is very uniform heating of the various radiator elements which not only adds to the life thereof but also avoids the overheating of any portion of the air. Openings 5? are formed in the walls i3 and id and provided with the closures dB and t9, the latter of which is provided with a packed flange it which surrounds the coal feeding tube 68.

When the oil burner til is used instead of the coal burning stoker, the closure 69 is replaced by a closure l i.

It is also desirable to provide the casing til with a packed flange 72 which either surrounds the tube 52 of the coal burner or the tube 13 of the oil burner 60.

It can be seen from the foregoing that with this arrangement, the oil burner 58 can be placed in any one of three positions while whenthe coal burning stoker is employed, it can be set in either one of two positions.

It will also be seen that as heat is radiated from the walls ll, it is conducted by the walls 57 back into the air stream in a form which permits it to be picked up by the passing air current.

Obviously, this is also true of heat which is radiated outwardly against the reflecting liner 36.

It will also be noted that baiiie plates may be placed between the members it and ll as well as between the outer sides of the members 3? and the liner 38 without departing from the spirit of this invention.

It will be noted that by making the radiators in the form of aerofoils, the resistance to the how of air through the furnace is reduced to a each foil nearest the fire box diverging upward-' ly with relation thereto, a connecting duct between said foils extending around the front of the fire box, a connecting duct between one of said foils and the fire box, a smoke outlet from the second foil communicating with the atmosphere and a casing enclosing said fire box, air

foils, and connections from which casing warm air can be drawn for house heating purposes.

2. In a furnace of the class described, the

I combination of a retort having a fire box disposed above same, the sides of said fire box converging steeply in an upward direction to form a ridge, an upwardly tapering hollow air foil on each side of said fire box and spaced therefrom, a smoke outlet connection from the fire box to the interior of one of said foils, a smoke connection between said foils, and a smoke outlet from the second foil to the atmosphere and a casing enclosing said fire box and foils, the uppermost side of said casing converging towards the center of the furnace substantially in parallelism with the outermost sides of the foils and spaced therefrom. MAX C. RICHARDSON. 

